How to change the default frequency unit while exporting the S-parameters matrix in HFSS?

It is possible to change the frequency unit when exporting your S-parameters matrix by following these steps:

1. Click on HFSS > Design Settings.

2. Select the Export On Completion tab and check the "Export touchstone file after completing frequency sweep" option.

3. Click on "Set/View Export Preferences...".

4. Check the "Change output file format" option and select the desired unit.

5. Click "Save As Default".

Once you click Analyze to solve your model, a folder containing your S-parameters with the specified unit will be automatically exported. Also, you can click Analyze to export it for a model that already has a solution. Note that manually exporting the file will use the default unit (GHz).